Linux as host virtual machine

Create VMs with KVM on Oracle Linux

Kernel-based Virtual Machine (KVM) is an open-source type-1 (bare-metal) hypervisor. This functionality permits a host system, such as Oracle Linux 8, to host multiple virtual machines (VMs) or guests when running on supported hardware.

This tutorial will deploy Oracle Linux Kernel Virtualization Manager (KVM) to create a virtual machine.

Objectives

• Deploy KVM
• Deploy Cockpit for Virtual Machines
• Create Virtual Machine from an ISO
• Create Virtual Machine using Oracle Cloud Images

Prerequisites

Any Oracle Linux 8 or later system with the following configurations:

Validate Environment Supports Virtualization

Note: When using the free lab environment, see Oracle Linux Lab Basics for connection and other usage instructions.

grep -e 'vendor_id' /proc/cpuinfo 

[oracle@ol-node01 ~]$ grep -e 'vendor_id' /proc/cpuinfo vendor_id : GenuineIntel vendor_id : GenuineIntel vendor_id : GenuineIntel vendor_id : GenuineIntel vendor_id : GenuineIntel vendor_id : GenuineIntel 

[oracle@ol-node01 ~]$ lsmod |grep kvm kvm_intel 262144 0 kvm 696320 1 kvm_intel irqbypass 16384 1 kvm 

Install and Start KVM

sudo dnf module install virt -y 

sudo dnf install virt-install virt-viewer -y 

[oracle@ol-node01 ~]$ virt-host-validate QEMU: Checking for hardware virtualization : PASS QEMU: Checking if device /dev/kvm exists : PASS QEMU: Checking if device /dev/kvm is accessible : PASS QEMU: Checking if device /dev/vhost-net exists : PASS QEMU: Checking if device /dev/net/tun exists : PASS QEMU: Checking for cgroup 'cpu' controller support : PASS QEMU: Checking for cgroup 'cpuacct' controller support : PASS QEMU: Checking for cgroup 'cpuset' controller support : PASS QEMU: Checking for cgroup 'memory' controller support : PASS QEMU: Checking for cgroup 'devices' controller support : PASS QEMU: Checking for cgroup 'blkio' controller support : PASS QEMU: Checking for device assignment IOMMU support : WARN (No ACPI DMAR table found, IOMMU either disabled in BIOS or not supported by this hardware platform) QEMU: Checking for secure guest support : WARN (Unknown if this platform has Secure Guest support) 

sudo systemctl enable --now libvirtd.service sudo systemctl status libvirtd.service 

[oracle@ol-node01 ~]$ sudo systemctl enable --now libvirtd.service [oracle@ol-node01 ~]$ sudo systemctl status libvirtd.service * libvirtd.service - Virtualization daemon Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor pr> Active: active (running) since Mon 2022-06-13 21:28:19 GMT; 8s ago Docs: man:libvirtd(8) https://libvirt.org . 

Setup Cockpit Web Console to manage KVM on Oracle Linux

sudo dnf install cockpit cockpit-machines –y 

sudo systemctl enable --now cockpit.socket sudo systemctl status cockpit.socket 

[oracle@ol-node01 ~]$ sudo systemctl enable --now cockpit.socket Created symlink /etc/systemd/system/sockets.target.wants/cockpit.socket -> /usr/lib/systemd/system/cockpit.socket. [oracle@ol-node01 ~]$ sudo systemctl status cockpit.socket * cockpit.socket - Cockpit Web Service Socket Loaded: loaded (/usr/lib/systemd/system/cockpit.socket; enabled; vendor pres> Active: active (listening) since Mon 2022-06-13 21:39:24 GMT; 10s ago Docs: man:cockpit-ws(8) Listen: [::]:9090 (Stream) . 

sudo firewall-cmd --add-service=cockpit --permanent sudo firewall-cmd --reload 

ssh -L 9090:localhost:9090 oracle@

Open a web browser on your desktop and browse to https://localhost:9090. Cockpit web console uses a self-signed certificate to enable HTTPS. Click Advanced and accept the connection when you get a warning from the browser.

Login as oracle user with password of oracle . The Cockpit Dashboard is displayed.

Click the “Limited Access” button to gain Administrative privileges.

Close the Administrative access window.

Create Virtual Machine from an ISO

1. Click the “Virtual Machines” option in the navigation panel on the left.
2. Click the “Create VM” button.
3. Provide the following information:

Name: OL-demo Connection: System Installation type: URL (ISO image or distro install tree) Installation source: https://yum.oracle.com/ISOS/OracleLinux/OL8/u8/x86_64/OracleLinux-R8-U8-x86_64-dvd.iso Operating system: Oracle Linux 8.8 Storage: Create new volume Size: 20 GiB Memory: 16 GiB 

Click “Create and run” to begin.

From the list of Virtual Machines, click the OL-demo link.

Scroll down to view the VNC Console. If you’re quick enough, you will see a menu with the options to Install Oracle Linux or Test this media and Install. The Test option will be selected by default after a few seconds. The installer will validate the content on the media is good and then start the installer.

Once the installer boots, you are presented with the Welcome to Oracle Linux screen. You begin the installation by selecting your language for the installation process. This lab does not continue with the installation process.

Note: You can watch a free video demonstrating the Oracle Linux installation process at this video link: Installing Oracle Linux 8

Create Virtual Machine using Oracle Cloud Images

Note: Ensure you enter the following commands from your cloud instance (ol-node01) terminal window.

sudo curl -O https://yum.oracle.com/templates/OracleLinux/OL8/u8/x86_64/OL8U8_x86_64-kvm-b198.qcow 

cat  'EOF' | sudo tee ~/meta-data > /dev/null instance-id: iid-local01 local-hostname: vm-01 EOF 

cat  'EOF' | sudo tee ~/user-data > /dev/null #cloud-config system_info: default_user: name: opc ssh_authorized_keys: - EOF 

SSHKEY=$(cat ~/.ssh/id_rsa.pub) sed -i "s||$SSHKEY>|g" ~/user-data 

sudo genisoimage -output /var/lib/libvirt/images/vm-01.iso -volid cidata -joliet -rock ~/user-data ~/meta-data 

sudo cp /var/lib/libvirt/images/OL8U8_x86_64-kvm-b198.qcow /var/lib/libvirt/images/vm-01.qcow sudo virt-install --name vm-01 \ --memory 2048 \ --vcpus 2 \ --disk /var/lib/libvirt/images/vm-01.qcow,device=disk,bus=virtio \ --disk /var/lib/libvirt/images/vm-01.iso,device=cdrom \ --os-type linux --os-variant ol8.6 \ --virt-type kvm --graphics none \ --network network=default,model=virtio \ --noautoconsole \ --import 

sudo virsh net-dhcp-leases --network default 

Note: Depending on how quickly the virtual machine starts, you may need to run the command again to display the IP address.

sudo virsh domiflist vm-01 

sudo virsh net-dhcp-leases --network default --mac 

[oracle@ol-node01 images]$ ssh opc@192.168.122.46 The authenticity of host '192.168.122.46 (192.168.122.46)' can't be established. ECDSA key fingerprint is SHA256:xcuVfQdoFDCC72i7plD0OfqDTSBG6QWhOm5ti4HIKEs. Are you sure you want to continue connecting (yes/no/[fingerprint])? yes Warning: Permanently added '192.168.122.46' (ECDSA) to the list of known hosts. [opc@vm-01 ~]$ uname -a Linux ol-node01 5.15.0-101.103.2.1.el8uek.x86_64 #2 SMP Mon May 1 20:11:30 PDT 2023 x86_64 x86_64 x86_64 GNU/Linux 

[Optional] View VM from Cockpit Dashboard

Note: Run this next command from a terminal on the lunabox Desktop.

1. Enter the following command from your lunabox Desktop terminal window to create a local port forward for Cockpit using ssh.

ssh -L 9090:localhost:9090 oracle@

Open a web browser on your desktop and browse to https://localhost:9090.

Login as oracle user with password of oracle . The Cockpit Dashboard is displayed.

If necessary, click the “Limited Access” button to gain Administrative privileges.

Click the “Virtual Machines” option in the navigation panel on the left.

From the list of Virtual Machines, click the vm-01 link.

Explore as desired the Overview section, Disks section, Network interfaces, etc.

Note: The console is not active within Cockpit as the vm-01 virtual machine was created using the —graphical none option with virt-install .

For More Information:

More Learning Resources

Explore other labs on docs.oracle.com/learn or access more free learning content on the Oracle Learning YouTube channel. Additionally, visit education.oracle.com/learning-explorer to become an Oracle Learning Explorer.

For product documentation, visit Oracle Help Center.

Create VMs with KVM on Oracle Linux

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